Can anyone identify the lens attached? It looks kind of like a DA 70, but I don't own any of the limiteds so I can't be sure. If it's positively identified as a DA lens, that would rule out the 645D idea. I wouldn't mind of this was the front of a new, more compact, full-featured pentax (the front control dial makes me think it'll be a higher-spec camera).

and there's no harm in it using a DA lens.... if they were making a 645D, then they'd need lenses to go with it... so a medium format DA range?

Looking at the direction and length of the blur of the PENTAX logo in that image, and trying to reinterpret the shape of the camera as a whole, I have to say I don't think it looks like a 645D. More like a traditional SLR shape.

Well, it has a front dial, it's wearing a DA limited, it has a front E-dial, and the mirror-box/flash area has been reworked (smaller now) but I see the hint of a button where the flash button is usually located so I'm not going to assume it lacks a built-in-flash just yet, and it's not a 645D, X70, or previous DSLR.